package server;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class StaticResourceUtil {

    //获取静态资源文件的绝对路径
    public static String getAbsolutePath(String path){
        String absolutePath = StaticResourceUtil.class.getResource("/").getPath();
        return absolutePath.replaceAll("\\\\","/")+path;
    }

    public static void outputStaticResource(InputStream inputStream, OutputStream outputStream) throws IOException {
        int count =0;
        while(count == 0){
            count = inputStream.available();
        }

        int resourceSize =count;
        //输出http请求头，然后再输出具体内容
        outputStream.write(HttpProtocolUtil.getHttpHeader200(resourceSize).getBytes());

        //读取内容输出
        long written =0; //已经读取的内容长度
        int byteSize =1024; //计划每次缓冲的长度
        byte[] bytes = new byte[byteSize];

        while(written <resourceSize){
            if (written + byteSize >resourceSize){  //说明剩余未读取大小不足一个1024长度，那就按真实长度处理
                byteSize = (int)(resourceSize -written); //剩余的文件内容长度
                bytes =new byte[byteSize];
            }

            inputStream.read(bytes);
            outputStream.write(bytes);

            outputStream.flush();
            written +=byteSize;
        }
    }
}
